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You can find him in da club, or, on Aug. 30, you can find rapper 50 Cent performing a "secret" concert in the schoolyard at PS 40 in his old hood, Jamaica, Queens.

But police fear that the free-for-all could lead to a brouhaha as the notoriously beef-heavy rapper plays an area difficult to secure, the Postreported.

"We can't control the area," one shaken law-enforcement source told the paper. The source noted that the performance is part of a "an outdoor event -- people could walk in from anywhere."

The concert is part of a "Family Day" sponsored by the G-Unity Foundation and the Bette Midler-founded New York Restoration Project, so it promises to be kid friendly -- but cops fear some grown-up gripes could take place.

"Someone's gonna try to make name for themselves," another source told the Post. "They're gonna take a shot at him, and they're going to hit him or they're going to miss him and hit some poor, innocent kid or grandmother."

Indeed, the event at 109-20 Union Hall Street is only a hip-hop, skip and jump from where 50, aka Curtis Jackson, was infamously shot and nearly killed in 2000.

The surprise concert is expected to draw at least 10,000 people, and cops are reportedly planning to send an army of officers to the area to lock down the South Jamaica Houses during the show.

Of course, the Post even found some local teens who were said they were too shook to attend the show.

"There's word out there that there's going to be some shootings, Mike Terrients, 15, told the paper. "Some of my friends ' parents are saying that they don't want them to go because something is going to happen."

Organizers and the Parks Department stressed that Mr. Cent wouldn't actually take the stage, but his mug is on the flier for the show, and his publicist told the Post that the "Wanksta" rapper would make an appearance.